为什么JWT令牌中的标头和有效载荷始终以eyJ开头 [英] Why header and payload in the JWT token always starts with eyJ

问题描述

我正在使用JWT令牌来授权我的API，在实现过程中，我发现令牌中的标头和有效载荷始终以eyJ开头.这说明什么?

I am using JWT token to authorize my APIs, during implementation I found header and payload in token always start with eyJ. What does this indicate?

推荐答案

JWT由 base64url编码的JSON组成，并且JSON结构仅以{"...开头，当使用base64编码器进行编码时，该格式将变为ey.... JWT标头以{"alg":...开头，然后变为eyJ...

JWTs consist of base64url encoded JSON, and a JSON structure just starts with {"..., which becomes ey...when encoded with a base64 encoder. The JWT header starts with {"alg":..., which then becomes eyJ...

您可以尝试使用在线编码器，然后输入{"alg"并单击编码".结果将是eyJhbGciPSA=

You can try on this online encoder and enter {"alg" and click on encode. The result will be eyJhbGciPSA=

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